kernel/linux.git/fs/fat/misc.c, branch v7.0.10

fs: refactor ->update_time handling

2026-01-12T13:01:32+00:00

Pass the type of update (atime vs c/mtime plus version) as an enum instead of a set of flags that caused all kinds of confusion. Because inode_update_timestamps now can't return a modified version of those flags, return the I_DIRTY_* flags needed to persist the update, which is what the main caller in generic_update_time wants anyway, and which is suitable for the other callers that only want to know if an update happened. The whole update_time path keeps the flags argument, which will be used to support non-blocking updates soon even if it is unused, and (the slightly renamed) inode_update_time also gains the possibility to return a negative errno to support this. Signed-off-by: Christoph Hellwig Link: https://patch.msgid.link/20260108141934.2052404-6-hch@lst.de Reviewed-by: Jan Kara Signed-off-by: Christian Brauner

fat: cleanup the flags for fat_truncate_time

2026-01-12T13:01:32+00:00

Fat only has a single on-disk timestamp covering ctime and mtime. Add fat-specific flags that indicate which timestamp fat_truncate_time should update to make this more clear. This allows removing no-op fat_truncate_time calls with the S_CTIME flag and prepares for removing the S_* flags. Signed-off-by: Christoph Hellwig Link: https://patch.msgid.link/20260108141934.2052404-5-hch@lst.de Acked-by: OGAWA Hirofumi Signed-off-by: Christian Brauner

fat: fix too many log in fat_chain_add()

2025-08-02T19:01:40+00:00

This log was excessive for a serial console. So use the ratelimited version instead. Link: https://lkml.kernel.org/r/87qzy611d9.fsf@mail.parknet.co.jp Signed-off-by: OGAWA Hirofumi Reported-by: syzbot+fa7ef54f66c189c04b73@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=fa7ef54f66c189c04b73 Cc: Namjae Jeon Cc: Sungjong Seo Signed-off-by: Andrew Morton

fat: convert to new timestamp accessors

2023-10-18T12:08:03+00:00

Convert to using the new inode timestamp accessor functions. Signed-off-by: Jeff Layton Link: https://lore.kernel.org/r/20231004185347.80880-35-jlayton@kernel.org Tested-by: Klara Modin Signed-off-by: Christian Brauner

fs: drop the timespec64 argument from update_time

2023-08-11T07:04:57+00:00

Now that all of the update_time operations are prepared for it, we can drop the timespec64 argument from the update_time operation. Do that and remove it from some associated functions like inode_update_time and inode_needs_update_time. Signed-off-by: Jeff Layton Reviewed-by: Jan Kara Message-Id: <20230807-mgctime-v7-8-d1dec143a704@kernel.org> Signed-off-by: Christian Brauner

fat: make fat_update_time get its own timestamp

2023-08-11T07:04:56+00:00

In later patches, we're going to drop the "now" parameter from the update_time operation. Fix fat_update_time to fetch its own timestamp. It turns out that this is easily done by just passing a NULL timestamp pointer to fat_truncate_time. Signed-off-by: Jeff Layton Acked-by: OGAWA Hirofumi Reviewed-by: Jan Kara Reviewed-by: Frank Sorenson Message-Id: <20230810-ctime-fat-v1-2-327598fd1de8@kernel.org> Signed-off-by: Christian Brauner

fat: remove i_version handling from fat_update_time

2023-08-11T07:04:56+00:00

commit 6bb885ecd746 (fat: add functions to update and truncate timestamps appropriately") added an update_time routine for fat. That patch added a section for handling the S_VERSION bit, even though FAT doesn't enable SB_I_VERSION and the S_VERSION bit will never be set when calling it. Remove the section for handling S_VERSION since it's effectively dead code, and will be problematic vs. future changes. Cc: Frank Sorenson Signed-off-by: Jeff Layton Acked-by: OGAWA Hirofumi Reviewed-by: Jan Kara Reviewed-by: Frank Sorenson Message-Id: <20230810-ctime-fat-v1-1-327598fd1de8@kernel.org> Signed-off-by: Christian Brauner

fat: convert to ctime accessor functions

2023-07-24T08:29:59+00:00

In later patches, we're going to change how the inode's ctime field is used. Switch to using accessor functions instead of raw accesses of inode->i_ctime. Signed-off-by: Jeff Layton Message-Id: <20230705190309.579783-42-jlayton@kernel.org> Signed-off-by: Christian Brauner

fat: remove time truncations in vfat_create/vfat_mkdir

2022-05-19T21:10:31+00:00

All the timestamps in vfat_create() and vfat_mkdir() come from fat_time_fat2unix() which ensures time granularity. We don't need to truncate them to fit FAT's format. Moreover, fat_truncate_crtime() and fat_timespec64_trunc_10ms() are also removed because there is no caller anymore. Link: https://lkml.kernel.org/r/20220503152536.2503003-4-cccheng@synology.com Signed-off-by: Chung-Chiang Cheng Acked-by: OGAWA Hirofumi Signed-off-by: Andrew Morton

fat: ignore ctime updates, and keep ctime identical to mtime in memory

2022-05-19T21:10:31+00:00

FAT supports creation time but not change time, and there was no corresponding timestamp for creation time in previous VFS. The original implementation took the compromise of saving the in-memory change time into the on-disk creation time field, but this would lead to compatibility issues with non-linux systems. To address this issue, this patch changes the behavior of ctime. It will no longer be loaded and stored from the creation time on disk. Instead of that, it'll be consistent with the in-memory mtime and share the same on-disk field. All updates to mtime will also be applied to ctime in memory, while all updates to ctime will be ignored. Link: https://lkml.kernel.org/r/20220503152536.2503003-2-cccheng@synology.com Signed-off-by: Chung-Chiang Cheng Acked-by: OGAWA Hirofumi Signed-off-by: Andrew Morton